The invention relates to a clamping device for a rod which moves in an axial translatory or rotating manner. Said clamping device comprises a housing, a clamping sleeve which is axially fixed therein, a tensioning piston which can be displaced in the housing embodied as a cylinder, and a spring device for pre-tensioning the piston in the direction of the clamping sleeve in the locking state. Said spring device includes at least one helical plate spring which, in the event of a fracture, maintains the holding force and the dynamic course of the same. In one embodiment, the at least one helical plate spring is coaxially arranged in relation to the rod. In another embodiment, a plurality of helical plate springs are arranged on the circumference of the rod such that they are parallel with the axis thereof, for distribution of a pre-tensioning force acting on the spring device.